Electrician
Voltage drop, conduit and box fill, circuit loads and the service load calc. 5 tools: one is free, the rest are premium.
Free for electrician
Voltage drop and wire size
Voltage drop for a copper or aluminum run and the smallest wire that keeps drop under your target. No account needed.
Premium tools
All of them come with the electrician plan.
EMT conduit fill check
Percent fill of an EMT conduit for a number of THHN conductors against the NEC 40% rule.
Construction · ElectricalCircuit load and breaker sizing
Load current, breaker size with the 125% continuous rule and a matching copper conductor.
Construction · ElectricalBox fill check
Volume a box needs for its conductors, devices, clamps and grounds under NEC 314.16, against the box you plan to set.
Construction · ElectricalDwelling service load calculation
Calculated load of a house under the NEC 220.82 optional method, in amps at 240 V, against the service it has today.
Construction · ElectricalThe electrician plan
All 5 electrician tools, one plan
$10.20 a month at the launch price (list $12). Save more paying by the quarter or year; add another role for less. 2 of them are still waiting on a trade expert's check; their cards say so.